NATE HEAT PUMP EXAM (ACTUAL EXAM)
WITH 180+ QUESTIONS WITH VERY
ELABORATED ANSWERS CORRECTRY WELL
ORGANIZED LATEST 2024 – 2025 ALREADY
GRADED A+
heat pump defrosts even when there is no ice on the outside coil. Which of the
following is most likely the problem?
A: The defrost time clock is set for too short a cycle
B: The outdoor coil is dirty and the system uses a pressure differential type of
defrost initiation
C: The sensing bulb of the defrost control is mounted too close to the bottom of
the outdoor coil
, D: Each of these could cause the problem - ANSWERS-D: Each of these could
cause the problem
A technician places a heat pump into the auxiliary electric heating mode with the
compressor de-energized. He measures a temperature rise between the return
and supply air of 40 degrees. The measured voltage at the electric elements is
exactly 222 volts and the measured amperage of the heaters is 60 amps. Using
the equation CFM = BTU divided by 1.08 x TD, what is the CFM of the system?
A: 825 CFM
B: 950 CFM
C: 1055 CFM
D: 1500 CFM - ANSWERS-C: 1055 CFM
222 x 60 = 13,320watts
13, = 13.32 Kw
btuh = 13.32 x 3415 = 45,488
cfm =((45,488 / (1.08 x 40))
cfm = 45,.2 = 1052.95
Solid state defrost control boards can be adjusted to:
,A: Program the thermostat from outside the house
B: Change the frequency of defrosts
C: Control the speed of the outdoor fan during defrost
D: Control the speed of the indoor fan during defrost - ANSWERS-B: Change the
frequency of defrosts
Which of the following components is exclusive to the heat pump?
A: Condenser
B: Oil separator
C: Reversing valve
D: Accumulator - ANSWERS-C: Reversing valve
Which of the following airflow rates is the most reasonable for a heat pump
system operating in the heating cycle?
, A: 200 cfm per ton
B: 300 cfm per ton
C: 400 cfm per ton
D: 450 cfm per ton - ANSWERS-D: 450 cfm per ton
During the heat pump's cooling cycle, the outdoor coil is utilized as a _________
while the indoor coil is utilized as a____________.
Heat is present in winter outdoor air until the outside air ambient temperature
reaches a low temperature of:
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